Regular Expression for mm/dd/yyyy

Regular Expression which accepts mm/dd/yyyy format is

\b(0?[1-9]|1[0-2])(\/)(0?[1-9]|1[0-9]|2[0-9]|3[0-1])(\/)([1-9][0-9][0-9][0-8])\b

Valid Formats:

1/2/2005
12/28/2006
12/12/2099